code: def test_get_padding_lengths_returns_nothing(self):
      flag_field = FlagField(True)
      assert flag_field.get_padding_lengths() == {}
  
file_path: allennlp/tests/data/fields/flag_field_test.py
imports: import pytest
  from allennlp.common.testing.test_case import AllenNlpTestCase
  from allennlp.data.fields import FlagField
label_desc: Use image node_id 1 for calling the TestFlagField obj's underlying member method code with example usage: obj.test_get_padding_lengths_returns_nothing() without return types